Nariman is a freelance architect based in Toronto. He helps businesses, large and small, define and execute effective internet strategies.

Thursday, September 23, 2010

How to Remove the Evercookie?

One of my colleagues just sent this out – it’s truly amazing [1].

Check out the Web History link that uses a CSS trick to reveal your history (all on the latest FF).

From the author himself [2]:

evercookie is a javascript API available that produces extremely persistent cookies in a browser. Its goal is to identify a client even after they've removed standard cookies, Flash cookies (Local Shared Objects or LSOs), and others.

evercookie accomplishes this by storing the cookie data in several types of storage mechanisms that are available on the local browser. Additionally, if evercookie has found the user has removed any of the types of cookies in question, it recreates them using each mechanism available.

Specifically, when creating a new cookie, it uses the following storage mechanisms when available:

This is a case of layering several techniques (some known, others new) to create an approach that requires some serious thought to defeat. Much like the MS vulnerability disclosed this week, I think this is more about bringing information to light to promote discussion and progress. As one comment put it, “the bad guys don’t make open source announcements, they keep the code to themselves.”)

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